The price change in 2017 may be low with just a 3% rise, but the average rise since 2011 has been higher, especially for the higher power users.

For example, using an actual bill for the consumption of 2,935 kWh in one quarter:
In 2011, the bill was $579.45, or $6.37 per day.
In 2017, the cost for 2,935 kWh in a quarter would be $905.61 or $9.95 per day

This is an average annual increase of 7.725% during the years between 2011 and 2017.

If 2011 was compared to 2016, the figures would be:
In 2011, the bill was $579.45, or $6.37 per day.
In 2016, the cost for 2,935 kWh in a quarter would be $867.53 or $9.53 per day

This is an average annual increase of 8.406% during the years between 2011 and 2017.

So the lower rise in 2017 has brought the total average rise down in 2017.